JPH11144989A - Method for fixing iron core main leg - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for fixing iron core main leg for which the number of manufacture processes are greatly reduced. SOLUTION: The side surface of an iron core main leg 1 is formed almost round, the outer periphery of the main leg 1 is covered with an insulting cylinder 8 with spacers 1 and 12 in between, the outer periphery of the insulating cylinder 8 is clamped at a plurality of points in the longitudinal direction of the main leg 1 by a clamping band 9, when the main leg 1 is raised vertically together with a lower part yoke, and when a coil is lowered from above the main leg 1, the coil is fit-inserted in the main leg 1, while the clamping band 9 close to the coil is removed sequentially.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fixing an iron core main leg for a transformer, and more particularly to a method for greatly reducing the number of manufacturing steps.

[0002]

2. Description of the Related Art FIG. 4 is a side view showing the structure of a core main leg fixed by a conventional method. The lower portions of the three main legs 1 of the three-phase transformer core are magnetically coupled via a lower yoke (not shown) and are sandwiched by a frame 2. Some parts in the length direction of the main leg 1 are fastened with a glass tape 3.

FIG. 5A is a sectional view taken along the line CC of FIG.
5B is a perspective view of a main part showing the configuration of the spacing piece 4 of FIG. 5A. As shown in FIG. 5A, the main legs 1 are laminated with steel plates having different widths, and the cross-section thereof is formed in a substantially round shape in a step shape. Where the outer periphery of the main leg 1 is stepped, an insulating spacer 4 is attached so as to make the periphery round. As shown in FIG. 5B, the spacing piece 4 has cutouts 4A formed at various locations in the length direction. The wound layer of the glass tape 3 fits into the notch 4A.

FIG. 6 is a perspective view of a main part of FIG. The glass tape 3 is wound through the inside of the notch 4A, and is wound up to a position near the opening of the notch 4A. Thereby, the layer of the glass tape 3 does not protrude from the spacing piece 4 to the outer diameter side. Returning to FIG. 4, since the main leg 1 laminated with a steel plate is fixed by the glass tape 3, the main leg 1 can be raised vertically together with the frame 2 in this state. In addition, fixing with the glass tape 3
The vibration of the iron core is suppressed to prevent noise.

FIG. 7 is a sectional view showing the structure around the main leg 1 in FIG. 4 when the winding is inserted into the main leg.
This corresponds to the position of the C section. The outer periphery of the configuration shown in FIG. 5A is further covered with an insulating tube 5, and a plurality of insulating spacers 6 are arranged on the outer periphery of the insulating tube 5 at intervals. FIG. 8 is a side view showing a state where the winding is being inserted into main leg 1 of FIG. The main leg 1 is erected vertically, the winding 7 is lowered from the upper part of the main leg 1 in the direction D, and the winding 7 is inserted along the outer periphery of the insulating spacer 6 in FIG.

The winding 7 is inserted into the main leg 1 of the other phase in FIG. 8 in exactly the same manner as described above. After the windings 7 are inserted into the main leg 1 in all three phases, an upper yoke (not shown) is joined to the upper end of the main leg 1, and an iron core is held between upper frames (not shown).

[0007]

However, the conventional method of fixing the iron main leg as described above has a problem that the number of manufacturing steps is greatly increased. That is, in order to make the outer circumference of the main leg round, the interval pieces having various cross-sectional shapes are manufactured according to the unevenness of the main leg, and the notch portions for fitting the glass tape are formed on each interval piece. I needed to. For this reason, a large number of man-hours have been required to manufacture the spacing piece. In addition, it is necessary to wind the glass tape around the main leg many times, and the number of winding steps is large.

[0008] An object of the present invention is to provide a method of fixing an iron core main leg in which the number of manufacturing steps is significantly reduced.

[0009]

In order to achieve the above object, according to the method of the present invention, the side surfaces of the iron core main legs are formed in a step-like substantially round shape by being laminated with steel plates having different widths. The outer periphery of the main landing gear is covered with an insulating cylinder via a spacing piece, and the main landing gear is raised vertically together with the lower yoke while the outer circumference of the insulating cylinder is tightened at a plurality of locations in the length direction of the main landing gear with a tightening band. Then, when the winding is lowered from above the main leg, the winding may be inserted into the main leg while sequentially removing the tightening band immediately adjacent to the winding. Since the notch is not formed on the spacing piece and the main leg is only temporarily tightened with the tightening band, it is not necessary to wind the glass tape many times. Thereby, the man-hour for fixing the iron core main leg is greatly reduced.

In the above method, the insulating cylinder may include a pair of half cylinders divided in a semicircular shape, and circumferential ends of the half cylinders may be overlapped with each other and fixed with an adhesive. It may be. Thereby, the outer periphery of the main leg is easily formed in a round shape by bonding the pair of half-split cylinders. Moreover, since it is a half-split cylinder, it is tightened to the inner diameter side by tightening the tightening band.

In the method, a round bar may be used as the spacing piece. Thus, a commercially available round bar may be appropriately selected according to the unevenness of the main landing gear, and the length direction may be cut in accordance with the height of the main landing gear.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. FIG. 1 is a side view showing a configuration of an iron core main leg fixed by a method according to an embodiment of the present invention. The lower portions of the three main legs 1 of the three-phase transformer core are magnetically coupled via a lower yoke (not shown) and are sandwiched by a frame 2. Some parts in the length direction of the main leg 1 are fastened by a fastening band 9.

FIG. 2 is a sectional view taken along line AA of FIG. The main leg 1 is laminated with steel plates having different widths, and its cross section is formed in a substantially round shape in a stepped manner. Where the outer periphery of the main leg 1 is uneven in steps, insulating spacers 11 and 12 are provided so as to make the periphery round. Furthermore, the spacing piece 1
The outer circumferences of the split cylinders 1 and 12 are covered with a pair of half cylinders 8A and 8B divided in a semicircular shape, and the circumferential ends of the half cylinders 8A and 8B are overlapped with each other via an adhesive (adhesive surface 13). ), The outer circumference of the main leg 1 is formed to be round. A plurality of insulating spacers 6 are arranged at an interval from each other on the outer periphery of the insulating cylinder 8 formed by the half cylinders 8A and 8B. The outer periphery of the insulating spacer 6 is tightened with a tightening band 9,
Fastened with a buckle 10.

Returning to FIG. 1, since the main leg 1 laminated with a steel plate is fixed by the tightening band 9, the frame 2 is
In addition, the main leg 1 can be raised vertically. After raising the main leg 1, the winding can be inserted into the main leg 1 in the state of FIG. FIG. 3 is a side view showing a state where the winding is being inserted into main leg 1 of FIG. The main leg 1 is erected vertically, and the winding 7 is lowered from the upper portion of the main leg 1 in the direction B.
The winding 7 is inserted along the outer periphery of the insulating spacer 6 of FIG.
When the lower end of the winding 7 comes to the tightening band 9, the winding 7 is inserted into the main leg 1 while sequentially removing the closest tightening band 9 </ b> A (dotted line). The windings 7 are inserted into the main legs 1 of the other phases in exactly the same manner as in FIG. Winding 7 is 3
After both phases are inserted into the main leg 1, an upper yoke (not shown) is joined to the upper end of the main leg 1, and an iron core is held between upper frames (not shown).

In FIG. 2, the gap pieces 11 and 12 do not require the notch processing which was conventionally required.
Man-hours for manufacturing the spacing piece have been greatly reduced. In addition, spacing piece 1
Since 1 was a round bar, a commercially available round bar was appropriately selected according to the concavities and convexities of the main leg 1, and it was only necessary to cut the length direction according to the height of the main leg 1. For this reason, the processing in the width direction of the spacing piece, which was conventionally required, is eliminated, and the man-hour for manufacturing the spacing piece is further reduced.

In FIG. 2, the outer circumference of the main leg 1 of the insulating cylinder 8 is easily formed into a round shape by bonding the pair of half-split cylinders 8A and 8B to each other. Half tube 8A, 8B
The main spacer 1 is securely fixed from the outer periphery of the insulating spacer 6 until the adhesive between them is hardened, so that the main leg 1 is securely fixed, vibration of the iron core is suppressed, and generation of noise is also prevented. Further, since the fastening band 9 may be fastened once with the buckle 10, a large number of winding operations are unnecessary unlike the conventional glass tape, and the man-hour for fixing the main leg 1 is further reduced. Further, since the tightening band 9 can be reused many times, the material cost can be reduced as compared with the case of the glass tape.

[0017]

According to the method of the present invention, the outer periphery of the main leg is covered with the insulating cylinder via the spacing piece, and the outer periphery of the insulating cylinder is tightened at a plurality of locations in the length direction of the main leg with a tightening band. In this state, the main leg is raised vertically together with the lower yoke, and when the winding is lowered from above the main leg, the winding is inserted into the main leg while sequentially removing the tightening band immediately adjacent to the winding. As a result, notch processing on the spacing piece is eliminated and only the main leg is temporarily tightened with the tightening band,
The man-hour for fixing the iron core main leg is greatly reduced, and the cost of the product can be reduced.

In this method, the insulating cylinder is composed of a pair of half cylinders divided in a semicircular shape, and the circumferential ends of the half cylinders are overlapped with each other and fixed with an adhesive. Thereby, the outer periphery of the main leg is easily formed in a round shape by bonding the pair of half-split cylinders. In addition, the half-barrel cylinder is tightened to the inner diameter side by the tightening of the tightening band, and the main leg can be securely fixed.

In this method, by using a round bar as the spacing piece, the number of manufacturing steps of the spacing piece is greatly reduced, and the cost of the product can be further reduced.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of an iron core main leg fixed in a direction according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a side view showing a state where the winding is being inserted into the main leg of FIG. 1;

FIG. 4 is a side view showing a configuration of an iron core main leg fixed by a conventional method.

5A is a cross-sectional view taken along the line CC of FIG. 4, and FIG. 5B is a perspective view of a main part showing a configuration of a spacing piece of FIG. 5A.

FIG. 6 is a perspective view of a main part of FIG.

FIG. 7 is a sectional view showing a configuration around the main leg of FIG. 4 when a winding is inserted into the main leg.

8 is a side view showing a state where the winding is being inserted into the main leg of FIG. 4;

[Explanation of symbols]

1: main landing gear, 2: frame, 3: glass tape, 4, 1
1,12: spacing piece, 5,8: insulating cylinder, 6: insulating spacer, 7: winding, 8A, 8B: half cylinder, 9: tightening band, 10: buckle

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takashi Takahagi 1-1-1, Tanabe-Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fuji Electric Co., Ltd.

Claims (3)

[Claims] 1. A side face of an iron core main leg is formed by laminating steel plates having different widths so as to be substantially rounded in a step-like manner, and the outer periphery of the main leg is covered with an insulating cylinder via a spacing piece. When the main leg is raised vertically with the lower yoke in a state where the outer circumference is tightened at a plurality of locations in the length direction of the main leg with a tightening band, and the winding is lowered from above the main leg,
A method of fixing an iron core main leg, wherein the winding is inserted into the main leg while sequentially removing a tightening band immediately adjacent to the winding. 2. The method of fixing an iron core main leg according to claim 1, wherein the insulating cylinder comprises a pair of half cylinders divided in a semicircular shape, and circumferential ends of the half cylinders overlap each other. A method of fixing an iron core main leg, which is performed and fixed with an adhesive. 3. The method of fixing a core main leg according to claim 1, wherein a round bar is used as the spacing piece.